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'I was so concentrated on taking pictures at the time that I hadn't realised that the starlings had created a giant bird in the sky.

'It took less than 10 seconds for the birds to create that formation.

'I realised that I had captured a unique snapshot, technically, sharp and in high quality.'

Mr Biber lives in Hilzingen, Germany, and now runs a bicycle business following his career as an aerospace engineer.

He managed to take a series of images which show the birds merging into the shape of a giant bird when they were targeted by a predator

And the unique snap has since earned him the top prize in an international photography competition

He has been taking pictures since 1981 when he started off with his first reflex camera and has been taking digital snaps since 2008.

Mr Biber has visited the northeast of Spain for a number of years and knew about the fascinating display that starlings put on.

But he said it took him four days to capture the unique moment after he had to scout out locations and get the lighting right.

Mr Biber added: 'I always have at least one camera on me whenever I leave the house.

'And I go on regular holidays to northeastern Spain where I have witnessed fantastic murmurations of starlings over the years.

'I've tried to photograph the starlings but it never worked out as well as I hoped for.

Mr Biber has visited the northeast of Spain for a number of years and knew about the fascinating display that starlings put on

'I eventually drove to the spot every day for four days in a row in order to capture them.

'I picked a spot where I thought they would turn up and picked a matching foreground and backdrop in order to put them in scene.

'It usually happens that birds of prey turn up and the starlings then create bizarre forms. It can be quite erratic and completely random.

'Sometimes it's fantasy formations which are then interpreted by our brain.

'A number of people were watching this display but they were observing it from other spots and might not have seen what I captured.'

Mr Biber, a semi-professional photographer, won the competition and has since had requests from experts who use his images to prove the difference between real and doctored images

The images were submitted to an international photography competition run by the bird observatory Vogelwarte Sempbach in Switzerland.

Organisers received 6,800 images for their 2017 competition which had been submitted by 540 photographers from 15 countries.

Mr Biber, a semi-professional photographer, won the competition and has since had requests from experts who use his images to prove the difference between real and doctored images.

He has also had requests from museums about a potential exhibition next year.

THE MYSTERY OF MURMURATIONS

Little is known about why murmurations occur, although it has been suggested that the displays help starlings by confusing predators.

Each bird mimics the movement of its neighbour, which ripples out to the whole flock.

In 2014, a research team from Warwick discovered that it is the areas of light and dark in the flocks that allow the starlings to fly so close together.

The pattern of light and dark, formed as the birds attempt to achieve the necessary density, is what provides vital information to individual birds within the flock.

Researchers said in 2014 that the gaps between them are key to the phenomenon, allowing the birds to find the perfect density. Pictured: A murmuration of starlings flying close to power lines at sunset near Gretna on the Scottish borders

Starlings are smaller than blackbirds, with a short tail, pointed head and triangular wings.

From a distance they appear black, but close-up they are very glossy with a sheen of purples and greens.

Even though the species remains one of the most common garden birds, its decline elsewhere makes it a red list species as a bird of high conservation concern.